Brake shoe



Aug. 5 1924, 1,503,514

. C. D. PETTIS 5 v BRAKE 4SHOE Filed Dec. '6, 1923 2 Sheets-Sheet 1 Shoes,

Patented Aug. 5, 1924.

. SITES CLIFTON D. PETTIS,

` OFFICE.

or NEW YORK, N. Y. l

BRAKE sH'oE.

,Application led December 6, 1923. Serial No. 678,793.

To all whom t may concern.'

Be it known that I, CLIFTON D. PETTIS, a citizen of the United States, residing in New York, in the county of New York and Slt-ate of New York, have invented certain new and useful Improvements in Brake of which the following is a specification.

This inventionrelates to brake shoes but Vmore particularly to that type which has a vticulated side and -end walls of the shell,

' Y Fig. 1 is aside elevation of an improved Vdepthas to come into contact with the wheel.

to increase'the strength of fthe shell and therefore' of the brake vshoe without increasing the wear on the wheel, and in general to provide an improved brake shoe.

The many other objects and advantages ofv my invention willbe better understood by reference to the following specification when considered in connection with/the accompanying drawings illustrating certain selected embodiments thereof. in' which brake shoe. f

Fig. 2 is a top plan'view of a shell blank. Fig. 3 is the same as Fig. 2, the shell being recticulated.- Y

Fig. tis a transverse sectional view of the shoe shown in Fig. 1. Y l Fig. 5 is-af longitudinal sectional view of a portion of the shoe shown in Fig. 1.

Fig. 6 is a transverse sectional view of the blank shown in Fig. 2. f

modified form of blank.

Fig.r 8 -is a top plan viewfof a modified form of blank.` Y

Fig. 9 is a transverse sectional view ,of-.a

flanged brake vshoe incorporating'a vshell formed from a: blank such as that shown yinv Fig. 8, and.

"Figs 10, 11 and 12 are transverse sectional views of modiliedforms Vof brake shoes.

e Referring to the drawings and particularly to Figs.,1Y to Ginclusive, thekb'rake shoe comprises a pan or shell l5 preferably of tough ductile metal, a cast body 16, a key lug 17 and end lugs 18. f

vIn the present embodiment the shell 15 is formed from ablank such as 19 (Figs. 2

and 6) having Ma relatively thick central portion 20 and athinner edge portion 21. The edge portion of the blank is then perforated or otherwise reticulated as at 22 (Fig. 3). Openings as 23 and 24 may be provided in ,the shell for key and end lugs respectively.

i The reduction in thickness of ftheblank in the present embodiment takes place wholly' on the top Lor outer face thereof, leaving the under or inner face flat as illustrated. The outer face of the edge portion is thus offset from the corresponding face of the thicker or central portion of the blank, The reasons for this will be presently` described. This reduction may be abrupt, substantially as at 25 (Fig. 6) orgradual, substantially as at 26 (Fig. 7). Y

The reticulated blank 19 is neXt bent substantially on the dotted line 27 (Fig. 3), into the usual pan shape (Fig. 1). This line is located within the portion 20 of the blank so that the thick metal extends around `the bend substantially as indicated in Figs.

4 and 5'. This provides a channelshape which is ofthe thickest section of the shell and thusgives great strengthl to the shell.

lAgt the Sametime the portions of theL thick part of thejshell do not extend to such a It is contemplated that the shoe will be removed from*A service before lthe same has worn beyondthe thinnerportions of the manner'described leaves a space which' isk 1 filled by the body metal of the shoe during Fig. 7 is a transversesectional'view of a Vthe casting operation as indicated at 28.

. Thus'the thin portions of the sides and ends of the shell are surrounded by the body "metal of the shoe and all are securely held and end walls are anchored within the bodymetal of the shoe. Furthermore, the body .metal on the outer face of each of these Walls protects the wallsy' This construction isof especial value when theshoe is worn thin.

I In Fig. .8 of the 'drawings is illustrated a t A the reticulations 39.

blank 30 for 'a V'shell particularly designed for 'use in" a brake shoe for locomotive driv-y ing Wheels. Here the thin portion 31 only extends about one side and both ends of the thicker portion 32. A section of a completed shoe 33 of this type is shown in Fig. 9. The portion 34 of the back which extends over the flange does not come 'in contact With the Wheel and consequently need not be of thinner section. Y

In Fig. 10 of the drawings is illustrated a modified form of shell in which the Walls are of uniform thickness and the depending portions 35 are bent inwardly as at 36 to provide odset portions 37. The body metalV of the shoe flows into the space 38 outside of the offset portions of the shell and thus causes these portions to be surrounded by this metal With the beneficial results previously described. The metal in the space 38 is united to the body of the shoe through In this embodiment the body metal of the shoe extends beyond the inside face of the depending portions 37 of the shell as at 3S', and thus makes an anchorage which more securely holds the body metal in the shell; This is of especial advantage when the shoe is Worn thin.

In Fig. 11 is'shown a further modification in Which the shell 40 is composed of a thick central portion 41 and thin edge portions 42, but this differs from the embodiment similarly illustrated in Fig. 4in that the reduction in thicknessv of the shell takes place upon the inner or under face. The

portions 42 of theshell are flush with the corresponding faces of the body of the shoe.

In Fig. 12 is illustrated a further modification in Which the depending Walls 43 are of relatively thin metal and bent inwardly, at 44, as in the embodiment shown Vin Fig. l0. The portion of the (shell at 45 is of relatively thick metal but this thicker por- 'tion does not extend 'about'the bend.

A It Will be evident from the foregoing description that my improved brake shoe is simple and economical in construction and stronger and more durable vthan those of a 'similar character heretofore produced. The

additional strength provided by the eXtension of the thick metal abon't'the bend does not result in increased Wear upon the rim of thefvvhe'el as'Would be the 'caseifthe entire v:shell were made of such metal. The-offset- Qtin'g 'ofthe depending -portions of the shell 'insures afb'etter' connection between the shell -`and lbody metal' ofthe'shoe and eliminates curling or rolling Vofthe shell. -'I have A:selected 'various "embodiments of "my invention to `fully illustrate, the prin- 'iple's involved jbut it should be distinctly un'dersto'odthat this is forthe purpose of fillust'rativi' and not limitation, for VI am avvare'that therform and 4arrangement may be' fmaterially :changed Without l departing a relatively thick central portion and relatively thin portions along the side edges thereof, the thick portion of said plate being bent along lines substantially parallel with each of said edges to form With the adjoining'thin portions the side Walls of the shell.

3. In a brake shoe, a reinforcing shell comprising a plate of ductile metal having a relatively thick central portion and relatively thin portions along the end edges thereof, the thick portion of said plate being bent downwardly along lines substantially parallel With each of said edges to form with the adjoining thin portions the end Walls of the shell.

4. In a brake shoe, a reinforcing 'shell comprising a plate of ductile metal having a relatively thick central portion and relatively thin portions along the side and end edges thereof, the thick portion of said plate being bent along lines substantially parallel with each of said edges to form With the adjoining thin portions the sides and end Walls of the shell. Y

5. In a brake shoe, a reinforcing 'shell comprising a back and side Walls, the side y Walls being of varying thickness.

6. In a brake shoe, a reinforcing shell comprising a back and endv Walls, the end Walls being of varyingthicl'rness.

7. In a brake shoe, a reinforcing shell comprising a back, sides and end Walls, they sides and endv Walls being of varying thickl ness.

8. In a brake shoe, a pan-shaped'reinforcing shell comprising a ductile metal plate having a relatively thick central portion and relatively thin edge portions, the side and end portions of said plate being bent down- Wardly to form the side and end Wallsof the shell With the thick metal of the central portion extending around the bendsfan'd'forming the upper portion of said Walls.

9. In a'brake shoe, a reinforcing shell of ductile metal comprising a back and side Walls, the outer face of a portion of-each of said side Walls being offset from the corresponding face-adjoining portion thereof.

10. In a' brake shoe, a reinforcing shell of ductile metal comprisinga back, sides and end Walls, the outer face of a portion of each of said sides and end walls being offset from the corresponding face of the adjoining portion thereof.

11. In a brake shoe, ay reinforcing shell of ductile metal comprising e back, sides and end walls, the sides and end walls being reticulated and the ,lower portion of the outer face of each offset inwardly from the upper portion thereof.

12. In a brake shoe, a substantially channel-shaped reinforcing shell comprising a back and depending side Walls, the lower portion of said walls being of reduced thickness.

13. In e brake shoe, a substantially channel-shaped reinforcing shell of ductile metal comprising a back and depending side walls, the lower portion of said walls being reticulated and of reduced thickness.

14. In e brake shoe, a reinforcing shell of tough ductile metal comprising e beck and depending side walls, the lower portion of said walls being offset inwardly from the outer face of the shoe.

15. In a brake shoe, a reinforcing shell of ductile metal comprising a back and turned down sides and end walls, the lower portion of said sides and end walls being ollfset inwardly from the outer face of the s oe.

16. In a. brake shoe, e. reinforcing shell of ductile metal comprising e back and turned down sides and end walls, the lower portion of the seid sides and end walls being reticulted and offset inwardly from the outer surface ofthe shoe. v

17. In a brake shoe, a reinforcing shell of tough ductile metal comprising a back and depending side walls, the lower portion of said walls being oset inwardly and surrounded by the body metal of the shoe.

18. In a. brake shoe, a reinforcing shell of ductile metal comprising a back and turned down sides and end walls, the lower Lportion of said sides and end walls being oEset in wardly and surrounded by the body metal of the shoe.

19. In arbrake shoe, a reinforcing shell of ductile metal comprising e back and turned down sides and end walls, the lower portion of the Said sides and end walls being reticulated and o'set inwardly and the offset portion surrounded by the body metal of the shoe, said body metal extending through the reticulation in said shell.

CLIFTON D. PETTIS. 

